Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/browser/safe_browsing/malware_details_cache.cc

Index: chrome/browser/safe_browsing/malware_details_cache.cc
diff --git a/chrome/browser/safe_browsing/malware_details_cache.cc b/chrome/browser/safe_browsing/malware_details_cache.cc
index 5c4ec37182492f9abcff281ce274e6fde1598451..b59b5c92c829b0b404dba5c7f73f4f4b963b1709 100644
--- a/chrome/browser/safe_browsing/malware_details_cache.cc
+++ b/chrome/browser/safe_browsing/malware_details_cache.cc
@@ -31,11 +31,7 @@ using safe_browsing::ClientMalwareReportRequest;
 static const uint32 kMaxBodySizeBytes = 1024;
 
 MalwareDetailsCacheCollector::MalwareDetailsCacheCollector()
-    : resources_(NULL),
-      result_(NULL),
-      has_started_(false),
-      current_fetch_(NULL) {
-}
+    : resources_(NULL), result_(NULL), has_started_(false) {}
 
 void MalwareDetailsCacheCollector::StartCacheCollection(
     net::URLRequestContextGetter* request_context_getter,